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The framework calls this member function when the user selects an item from a menu, when a child control sends a notification message, or when an accelerator keystroke is translated.

virtual BOOL OnCommand(
   WPARAM wParam,
   LPARAM lParam 


The low-order word of wParam identifies the command ID of the menu item, control, or accelerator. The high-order word of wParam specifies the notification message if the message is from a control. If the message is from an accelerator, the high-order word is 1. If the message is from a menu, the high-order word is 0.
Identifies the control that sends the message if the message is from a control. Otherwise, lParam is 0.

Return Value

An application returns nonzero if it processes this message; otherwise 0.


OnCommand processes the message map for control notification and ON_COMMAND entries, and calls the appropriate member function.

Override this member function in your derived class to handle the WM_COMMAND message. An override will not process the message map unless the base class OnCommand is called.

Note   This member function is called by the framework to allow your application to handle a Windows message. The parameters passed to your function reflect the parameters received by the framework when the message was received. If you call the base-class implementation of this function, that implementation will use the parameters originally passed with the message and not the parameters you supply to the function.

See Also

CWnd Overview | Class Members | Hierarchy Chart | WM_COMMAND | CCmdTarget::OnCmdMsg

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